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/* vim: set ts=8 sw=8 noexpandtab: */
/* The Cairo CSS Drawing Library.
* Copyright (C) 2008 Robert Staudinger
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <math.h>
#include <string.h>
#include <glib.h>
#include "ccss-cairo-background.h"
#include "ccss-cairo-image-cache.h"
#include "config.h"
static cairo_pattern_t *
create_pattern (ccss_cairo_image_t const *image,
double width,
double height,
double tile_width,
double tile_height)
{
cairo_t *cr;
cairo_surface_t *surface;
cairo_status_t status;
cairo_pattern_t *pattern;
g_return_val_if_fail (image, NULL);
/* Setup. */
surface = NULL;
status = cairo_pattern_get_surface (image->pattern, &surface);
if (status != CAIRO_STATUS_SUCCESS) {
g_warning ("%s", cairo_status_to_string (status));
return NULL;
}
surface = cairo_surface_create_similar (surface,
CAIRO_CONTENT_COLOR_ALPHA,
width, height);
cr = cairo_create (surface);
/* Drawing. */
cairo_pattern_set_extend (image->pattern, CAIRO_EXTEND_REPEAT);
cairo_set_source (cr, image->pattern);
cairo_paint (cr);
/* Cleanup. */
pattern = cairo_pattern_create_for_surface (surface);
cairo_destroy (cr), cr = NULL;
cairo_surface_destroy (surface), surface = NULL;
return pattern;
}
static void
repeat (ccss_cairo_image_t const *image,
cairo_t *cr,
int32_t width,
int32_t height,
double tile_width,
double tile_height)
{
cairo_pattern_t *pattern;
/* Create pattern for (width + tile_width, height + tile_height)
* so we can account for `background-position'. */
pattern = create_pattern (image,
width + tile_width, height + tile_height,
tile_width, tile_height);
g_return_if_fail (pattern);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_NONE);
cairo_set_source (cr, pattern);
cairo_pattern_destroy (pattern), pattern = NULL;
cairo_fill_preserve (cr);
}
static void
repeat_x (ccss_cairo_image_t const *image,
cairo_t *cr,
int32_t width,
int32_t height,
double tile_width,
double tile_height)
{
cairo_pattern_t *pattern;
/* Create pattern for (width + tile_width, tile_height)
* so we can account for `background-position'. */
pattern = create_pattern (image,
width + tile_width, tile_height,
tile_width, tile_height);
g_return_if_fail (pattern);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_NONE);
cairo_set_source (cr, pattern);
cairo_pattern_destroy (pattern), pattern = NULL;
cairo_fill_preserve (cr);
}
static void
repeat_y (ccss_cairo_image_t const *image,
cairo_t *cr,
int32_t width,
int32_t height,
double tile_width,
double tile_height)
{
cairo_pattern_t *pattern;
/* Create pattern for (tile_width, height + tile_height)
* so we can account for `background-position'. */
pattern = create_pattern (image,
tile_width, height + tile_height,
tile_width, tile_height);
g_return_if_fail (pattern);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_NONE);
cairo_set_source (cr, pattern);
cairo_pattern_destroy (pattern), pattern = NULL;
cairo_fill_preserve (cr);
}
static void
no_repeat (ccss_cairo_image_t const *image,
cairo_t *cr,
int32_t width,
int32_t height)
{
cairo_pattern_set_extend (image->pattern, CAIRO_EXTEND_NONE);
cairo_set_source (cr, image->pattern);
cairo_fill_preserve (cr);
}
/**
* ccss_cairo_background_fill:
*
* This function requires that a closed path exists, which is filled with
* the background. The path is not modified.
**/
void
ccss_cairo_background_fill (ccss_background_attachment_t const *bg_attachment,
ccss_color_t const *bg_color,
ccss_background_image_t const *bg_image,
ccss_background_position_t const *bg_position,
ccss_background_repeat_t const *bg_repeat,
ccss_background_size_t const *bg_size,
cairo_t *cr,
int32_t x,
int32_t y,
int32_t width,
int32_t height)
{
cairo_status_t status;
double dx;
double dy;
/* FIXME, we need "transparent" color g_return_if_fail (bg_color); */
cairo_save (cr);
if (bg_color && bg_color->base.state == CCSS_PROPERTY_STATE_SET) {
cairo_set_source_rgba (cr, bg_color->red,
bg_color->green,
bg_color->blue,
bg_color->alpha);
cairo_fill_preserve (cr);
}
if (bg_image && bg_image->base.state == CCSS_PROPERTY_STATE_SET) {
ccss_cairo_image_t const *image;
double tile_width;
double tile_height;
double xoff;
double yoff;
image = ccss_cairo_image_cache_fetch_image (bg_image->uri);
g_return_if_fail (image);
tile_width = bg_size ?
ccss_position_get_hsize (&bg_size->width,
width, height,
image->width,
image->height) :
image->width;
tile_height = bg_size ?
ccss_position_get_vsize (&bg_size->height,
width, height,
image->width,
image->height) :
image->height;
xoff = bg_position ?
ccss_position_get_pos (&bg_position->hpos,
width, tile_width) :
0;
yoff = bg_position ?
ccss_position_get_pos (&bg_position->vpos,
height, tile_height) :
0;
dx = tile_width / image->width;
dy = tile_height / image->height;
switch (bg_repeat ? bg_repeat->repeat : CCSS_BACKGROUND_REPEAT) {
case CCSS_BACKGROUND_REPEAT:
/* Normalise offsets, we don't create an infinite
* background pattern. */
xoff = fmod (xoff, tile_width) - tile_width;
yoff = fmod (yoff, tile_height) - tile_height;
/* FIXME: not rounding can make the background edges
* blurry, but when rounding we might be 1px off.
cairo_translate (cr, x + lround (xoff), y + lround (yoff)); */
cairo_translate (cr, x + xoff, y + yoff);
cairo_scale (cr, dx, dy);
repeat (image, cr, width / dx, height / dy,
tile_width / dx, tile_height / dy);
break;
case CCSS_BACKGROUND_REPEAT_X:
/* Normalise vertical offset, we don't create an infinite
* background pattern. */
xoff = fmod (xoff, tile_width) - tile_width;
/* FIXME: not rounding can make the background edges
* blurry, but when rounding we might be 1px off.
cairo_translate (cr, x + lround (xoff), y + lround (yoff)); */
cairo_translate (cr, x + xoff, y + yoff);
cairo_scale (cr, dx, dy);
repeat_x (image, cr, width / dx, height / dy,
tile_width / dx, tile_height / dy);
break;
case CCSS_BACKGROUND_REPEAT_Y:
/* Normalise horizontal offset, we don't create an infinite
* background pattern. */
yoff = fmod (yoff, tile_height) - tile_height;
/* FIXME: not rounding can make the background edges
* blurry, but when rounding we might be 1px off.
cairo_translate (cr, x + lround (xoff), y + lround (yoff)); */
cairo_translate (cr, x + xoff, y + yoff);
cairo_scale (cr, dx, dy);
repeat_y (image, cr, width / dx, height / dy,
tile_width / dx, tile_height / dy);
break;
case CCSS_BACKGROUND_NO_REPEAT:
/* FIXME: not rounding can make the background edges
* blurry, but when rounding we might be 1px off.
cairo_translate (cr, x + lround (xoff), y + lround (yoff)); */
cairo_translate (cr, x + xoff, y + yoff);
cairo_scale (cr, dx, dy);
no_repeat (image, cr, width / dx, height / dy);
break;
default:
g_assert_not_reached ();
/* Need some code here when building w/o assertions. */
break;
}
status = cairo_status (cr);
if (status != CAIRO_STATUS_SUCCESS) {
g_warning ("%s", cairo_status_to_string (status));
}
}
cairo_restore (cr);
}
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